Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Parametric amplifiers"”.
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Physics of Superconducting Travelling-Wave Parametric Amplifiers
Superconducting travelling-wave parametric amplifiers (TWPAs) are ultra-low-noise amplifiers that achieve amplification through the nonlinear kinetic inductance of superconductors. These devices can have near quantum-limited noise performance, and have important applications in quantum information …
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The Generation and Detection of Squeezed Microwave Photons Realized using Traveling-Wave Parametric Amplifiers
… In circuit quantum electrodynamics, Josephson parametric amplifiers play a crucial role in quantum-limited amplification and squeezed microwave generation. In this thesis, we develop a dual-pump, broadband Josephson traveling-wave parametric amplifier (JTWPA) to demonstrate non-degenerate …
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Impacts of higher-order dispersion coefficients and dispersion fluctuations on one-pump fiber optical parametric amplifier
… optical fiber which is useful for fiber optical parametric amplifiers (FOPA). The performance of FOPA i.e. parametric gain, amplification bandwidth, and saturation power are reliant on the efficiency of the FWM process. The random dispersion fluctuations (
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Few-cycle and cavity-enhanced optical parametric amplification
Optical parametric amplifiers have emerged as important optical sources by extending the properties of few-cycle laser sources, which exist only in materials with sufficiently large gain bandwidths, to wide array of spectral ranges. The work reported in this thesis relates to two areas for the …
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Second Order Nonlinear Silica-Based Fibers and Microspheres
… optical devices and instruments, such as optical parametric amplifiers (OPA) and optical parametric oscillators (OPO). In this thesis,we show how to overcome this intrinsic limitation, and introduce second order nonlinearity into silica fiber devices.
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Fabrication of Superconducting Reflectionless Filters for Quantum Microwave Circuits
… the performance of broadband quantum limited amplifiers. Superconducting implementations of reflectionless microwave filters offer a promising solution to mitigate these issues. The focus of this work is the fabrication and cryogenic characterization of reflectionless filters compatible with …
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High-efficiency, low-loss Floquet Josephson Traveling Wave Parametric Amplifier
… fundamental science necessitates quantum-limited amplifiers with near-ideal quantum efficiency and multiplexing capability. However, existing solutions achieve one at the expense of the other; for example, Josephson traveling wave parametric amplifiers (JTWPAs) are highgain, broadband, and …
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Study of an active RC line in the microwave region
… an external signal source (as is the case with parametric amplifiers) to accomplish gain. Due to the nature of its design, it is inherently more “broadbanded” than the parametric amplifier. Also, no external “pump” is needed since the device obtains gain by an entirely different principle. In …
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The dynamics and optimization of the radiation of a femtosecond diode pumped Yb:KGW laser /
… for pump of collinear and noncollinear optical parametric amplifiers.
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Performance of multichannel fiber optic parametric amplifier
… system is an optical amplifier. Fiber optical parametric amplifier (FOPA) can be used for several signal processing application including optical amplification, phase conjugate and wavelength conversion. FOPA operate based on a fiber nonlinearity known as four wave mixing (FWM). Fiber optical …
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Investigation of dual-pump fiber optical parametric amplifier using highly nonlinear dispersion shifted fiber
Using multi-pump Raman amplifier provides high parametric gain over wide bandwidth with low noise figure (NF). Contrary to Raman amplifiers (RA), fiber optical parametric amplifiers (FOPA) can provide high and flat parametric gain over a bandwidth of tens or hundreds of nanometers with low-noise …
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The Quest for Ideal Quantum Amplifiers
… qubits in each error correction cycle. Quantum amplifiers are a critical frontend quantum hardware to faithfully amplify single-photon-level readout signals above the orders of magnitude larger ambient and electronics noise at room temperature. However, existing quantum amplifiers face …
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Nonequilibrium behaviour and quasiparticle heating in thin film superconducting microwave resonators
… qubit readout, superconducting mixers and parametric amplifiers, and as multiplexers for other devices. The results described in this thesis apply to all thin film resonators, but are primarily described in the context of KIDs. I develop models of how constant absorbed power affects …
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Limits of High Harmonic Generation conversion efficiency
… the advent of new light sources like optical parametric amplifiers, different driving wavelengths became available and thus the scaling of the single atom response versus drive wavelength has attracted a lot of attention. A detailed analysis shows that the efficiency scales with w50 at the …
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Tapered Splice for Efficient Power Coupling to Small-Core Nonlinear Fibers
… of optical signal processing, such as Raman or parametric amplifiers. The small nonlinearity of conventional single-mode fibers sets a major limitation for these devices. A large nonlinearity can be achieved by having a large nonlinear coefficient, a small effective area, or both. Having a small …
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Efficient and coherent frequency conversions and nonlinear interference in optical parametric and atomic Raman processes
<p>By implementing a parametric down-conversion process with a strong signal field injection, we demonstrate that frequency down-conversion from pump photons to idler photons can be a coherent process. Contrary to a common misconception, we show that the process can be free of quantum noise. With …
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Superconducting Microwave Resonators for Low Loss Sensor Applications
… including as photon detectors, filter-banks, parametric amplifiers and increasingly as part of quantum circuits for qubit readout. The next generation of astronomy will require resonators that are very low in loss to create highly sensitive kinetic inductance detectors (KIDs). The multiplexing …
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Time-Variant Components to Improve Bandwidth and Noise Performance of Antennas
… design of low-noise devices (such as antennas, amplifiers, and filters) is essential to increase the communication range. Also, it is well known that the noise performance of a receiving radio is primarily determined by the frontend including the antenna, filter, and a low-noise amplifier. In …